/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.Resource;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.*;

/**
 *
 * @author sflesca
 */
public class ListaCategorie extends HttpServlet {
    @PersistenceContext(unitName = "NegozioPU")
    private EntityManager em;
    @Resource
    private javax.transaction.UserTransaction utx;

    
    
    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            utx.begin();
            Query q = em.createNamedQuery("Categoria.findAll");
            List listacat = q.getResultList();
            request.setAttribute("listacat", listacat);
            gotoPage("/listacat.jsp", request, response);
            utx.commit();
        } catch (RollbackException ex) {
            Logger.getLogger(ListaCategorie.class.getName()).log(Level.SEVERE, null, ex);
        } catch (HeuristicMixedException ex) {
            Logger.getLogger(ListaCategorie.class.getName()).log(Level.SEVERE, null, ex);
        } catch (HeuristicRollbackException ex) {
            Logger.getLogger(ListaCategorie.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SecurityException ex) {
            Logger.getLogger(ListaCategorie.class.getName()).log(Level.SEVERE, null, ex);
        } catch (IllegalStateException ex) {
            Logger.getLogger(ListaCategorie.class.getName()).log(Level.SEVERE, null, ex);
        } catch (NotSupportedException ex) {
            Logger.getLogger(ListaCategorie.class.getName()).log(Level.SEVERE, null, ex);
        } catch (SystemException ex) {
            Logger.getLogger(ListaCategorie.class.getName()).log(Level.SEVERE, null, ex);
        } finally {     
            
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

    public void persist(Object object) {
        try {
            utx.begin();
            em.persist(object);
            utx.commit();
        } catch (Exception e) {
            Logger.getLogger(getClass().getName()).log(Level.SEVERE, "exception caught", e);
            throw new RuntimeException(e);
        }
    }
    
    private void gotoPage(String address,
            HttpServletRequest request,
            HttpServletResponse response)
            throws ServletException, IOException {
        RequestDispatcher dispatcher =
                getServletContext().getRequestDispatcher(address);
        dispatcher.forward(request, response);
    }
}
